The declaration of independence signed in 1776 is considered the official start of the Revolution and the Treaty of Paris is considered the end, so how long did the American Revolution last?

The american revolution lasted from 1963 to Sep 3, 1983, 20 years

The American Revolutionary War started on Apr 19, 1775 and lasted until September 3, 1783, 8 years

The American Revolution did not start with the declaration of independence neither did the American Revolutionary War

The American Revolutionary War and The American Revolution ended with the Treaty of Paris in April 19, 1775